224 



The number recaptured was 14, or 46-7 per cent. ; 7 males (50 per cent.) and 

 7 females (46'6 per cent.). Six of the males were of adult size on recapture, averag- 

 ing 38'8 cm., compared with 35 cm. on liberation ; they were at liberty for an 

 average period of 385 days, and migrated from 8 to 236 miles, the average being 

 66"5 miles, and the mean rate of movement 1'7 miles. Five of the females were 

 of adult size, averaging 41 "8 cm. as against 37*3 cm. on liberation ; they were at 

 liberty for an average period of 319 days, and migrated distances of from 5 to 136 

 miles, the mean being 62*9 miles, and the mean rate 1*97 miles. 



The Extent and Direction of Migration. 



First Quarter. — A male was recaptured in September, on the same day as it 

 was liberated, at abo»4fc62 miles to the south and west. 



In October, 2 females were taken, 1 thirty miles to the south and west, and the 

 other 5J miles to the south and east. 



In November, a female was recaptured 5 miles to the south and east. 



In this quarter, 4, or 28*6 per cent, were recaptured. 



None was recaptured in the second quarter, and only 1 in the third quarter, a 

 male, north-east of Noss Head, 56 miles to the south and west. 



Fourth Quarter. — In June, 2 males and 2 females were taken, 1 male 8 miles 

 to the north and east, and the other 32 miles to the south and west, to the east of 

 the Orkneys. One female was also taken to the east of the Orkneys, 34 miles to 

 the south and west. The other female was recaptured on the west coast, 8 miles 

 west by north of Loch Inchard, south of Cape Wrath, at a distance of 136 miles. 



In July, a male was taken east of the Orkneys, 20 miles to the south and west, 

 and a female 6|- miles to the south and east. 



None was recaptured in August, so that the total for this quarter was 6, or 

 42"8 per cent., and in the 12 months following liberation, the number was 11, 

 or 78"6 per cent., of which 7, or 63 '6 per cent., were found to the south and west; 

 3 to the south and east, and 1 to the north and east. 



Of the remaining fish, a male was taken in May 1912, near Foula, 47 miles to 

 the northwards ; another male in July 1912, at a position described as 56° 49' N. ; 

 4° E., or 236 miles to the south and east. It was landed at Cuxhaven by a German 

 trawler. The last fish for this experiment was taken in August 1912, off Aberdeen, 

 133 miles to the south. 



[Table. 



